Our paper is now out in Hormones and Behaviour. We found little evidence for group differences in 2D:4D ratios by sexual orientation when jointly modeling publication bias and heterogeneity. w/ @fbartos.bsky.social, Ben Jones & @tvpollet.bsky.social www.sciencedirect.com/science/arti... 🧵1/9

Here are some options for hosting a living systematic review project A) A Quatro/Shiny website (we have code for this that can be adapted: github.com/iaiversen/AM...) B) OSF/Zenodo (easier but much less flexibility) C) A handful of journals support living systematic reviews

There are different types of contraception that prevent unintended pregnancy Methods incl.: ☑️ Hormonal contraceptives ☑️ Non-hormonal methods, like condoms or copper IUDs ☑️ Permanent surgical methods like vasectomies or female sterilization ☑️ Emergency contraception after sexual intercourse

New updates of {performance} and {see} arrived at CRAN, with some nice improvements for `check_model()`. You can now limit data points to boost performance for large models or hide confidence intervals for models with only few data and spuriously large intervals easystats.github.io/performance/...

Protect your kids from measles by ensuring they get two doses of the measles vaccine. Don’t leave health to chance. Check today’s daily dose.

Online #rstats conference Feb 25-26 is *free* for everyone. Almost all the speakers and workshop leaders are LGBTQ+ 🏳️‍🌈🏳️‍⚧️ and many are members of the rainbowR community 🌈 Sessions include a 2-hour "Intro to R" and closing keynote on Claude Code from @hadley.nz 🧠 16:00 UTC or 11am Eastern ⏰

If Bad Bunny can cover the history of Puerto Rico, colonialism, transatlantic slavery, hemispheric consciousness, as well as contemporary life and politics in under 14 minutes, you can do your 15- or 20-minute conference presentation with time to spare.

In this holistic way, we find regularities & variation in the timing & process of cooperative behavior & norm internalization. Children are more self-interested & resource-maximizing in early life everywhere we looked & tend to behave more in line with local norms through middle childhood. (3/5)

Asked GPT to create my caricature. Note: any association between R code errors and wine consumption is purely spurious.

Thomas is a scientist that I have the huge honour to work with. He truly fights for a more diverse and equal academic environment. This is so well-deserved.

🚨WINNER ANNOUNCEMENT🚨 EHBEA wants to congratulate @tvpollet.bsky.social on earning the EHBEA Award on Services to the Community 👏

Just one week left to apply!

New paper – and my first ✨Registered Report✨: Do hormonal contraceptives affect women’s sexuality? We studied both average effects and individual differences in effects using longitudinal data: doi.org/10.1177/2700...

🚨Two weeks left to apply for our postdoc positions @tse-fr.eu @iast.fr 🚨 Join me, @giuliandr.bsky.social , & @zhgarfield.com, to study punitive systems across societies. Full-time positions, 2 years, no teaching Deadline: Jan 23 Please share and spread the word! www.tse-fr.eu/groups/depar...

That was me waiting for a .qmd file to render… 31 hours later.

🚨🚨Last reminder for abstract submission!🚨🚨 ⏰ Abstract submission for #EHBEA2026 closes on 9 Jan (AOE effectively Saturday noon). 📌 Exception(!): papers part of a symposium (EvApecognition, AIvolution, etc.). For details, check our website! 👉www.ehbea2026.com

Reviewed a manuscript and recommended minor revisions. It was rejected mainly for reporting null results. Easy to see why psychology is still in a replication crisis in 2026. Sometimes it feels less methodological and more Freudian: null results just get repressed. Happy New Year!

#OnThisDay in 1831, the HMS Beagle departs on its second voyage with an unknown young naturalist aboard. The ship will eventually visit the Galapagos Islands where the scientist, Charles Darwin, will begin to formulate his theories on evolution. #HistoryOfScience

The Robust Bayesian Meta-Analysis package got updated with additional vignettes explaining how to perform Bayesian model-averaged publication bias-adjusted - multilevel meta-analysis (cran.r-project.org/web/packages...) - multilevel meta-regression (cran.r-project.org/web/packages...)

📢 PsyArXiv 12 Days of Christmas 🎄 🧑‍🎄 🎁 PsyArXiv moderators will be taking a holiday break from Dec 24 to Jan 4. Please avoid uploading work to the archive during this time to prevent a backlog, and expect some delays in moderation. We aim to clear any holiday backlog by Jan 16. Happy Holidays!

Work (also) with me! Two years postdoc in the @weaponisedpasts.bsky.social project, based in Edinburgh. Will do transmission chain experiments to understand the spread of heritage-based hostility, online and elsewhere. More info ⬇️⬇️⬇️

Another awesome paper led by a PhD student I am supervising. Facial femininity predicts jealousy in women, with the effect being stronger among heterosexual women. www.nature.com/articles/s41...

The United Kingdom is coming back to Erasmus+ 🇪🇺🇬🇧 We have concluded negotiations for the United Kingdom’s association to Erasmus+ in 2027, making further steps in our renewed EU-UK Strategic Partnership. More ↓ link.europa.eu/vf3vJk

Christmas has come early for those interested in sexual orientation data! 🎅📊 The Office for National Statistics has just released new sexual orientation data from the 2024 Annual Population Survey – and the story is one where the proportion of queer people in the UK continues to grow! 🧵

📚 New in Human Ethology: Only 1 in 4 indexed names in evolutionary psychology textbooks are women. This study maps gender representation across major textbooks and highlights ways to improve inclusion. 🔗 doi.org/10.22330/001... #HumanEthology #GenderBias #WomenInScience

📣 One week left to apply to our Toulouse Summer School in Quantitative Social Sciences! We have an exciting program for this year: www.tse-fr.eu/sites/defaul... 🗓️ May 26 to June 19, 2026 📍 Toulouse Application deadline: December 15 Apply here: www.tse-fr.eu/toulouse-sum... @tse-fr.eu @iast.fr

🚨 DEADLINE 🚨 EHBEA is searching for people who wants to help in the development of the evolutionary human sciences 👀 Do you feel like it? Then apply for PRESIDENT and/or SECRETARY for 2026-2029! Deadline? December 16/12/2025 More information?👇 👇 👇

Andy Conway and I are honored to serve as inaugural co-Editors of this new Psychonomics journal, focused on the rigorous study of individual differences in cognition. Please spread the word to potentially interested colleagues; we hope that you will send us your best relevant work!

I fully agree that a fully standardized effect size can often be a bad criterion for dismissing an effect. But somehow, instead of choosing more sensible metrics for evaluation, psychologists tend to conclude that hence any “significant” effect is potentially very important.

Applications are open for the 2026 Owen Aldis Award from ISHE at ishe.org/awards/. Support for innovative, observational, ethological research on human behavior: up to $8,000, plus membership and conference benefits. Deadline: 19 Jan 2026. Open to students worldwide!

Are you interested in doing a PhD about what humans infer about animal minds? Check out this opportunity @northumbriapsy.bsky.social with me, @mdconstable.bsky.social and Lee Shepherd! Deadline 23 Jan 2026 www.findaphd.com/phds/project...

Methodology

We're hiring a postdoc, to be based at Arizona State University, to research the PSYCHOLOGY OF ANTISEMITISM. Start date as early as Jan-12-25. Email for questions. Details: apply.interfolio.com/177756

🚨 ABSTRACT SUBMISSION 🚨 #EHBEA2026 will be held in Leiden! Do not forget to submit your abstract before December 15th in order to attend and share your research! More in the official account: @ehbea2026.bsky.social 👇👇👇

Coding Club: Creating an R Package by Lisa DeBruine #RStats https://bigbookofr.com/chapters/package%20development.html#coding-club-creating-an-r-package

Born #OnThisDay in 1867 was Marie Skłodowska–Curie, the first woman to win a Nobel Prize, the only woman to win twice and the only person to win a Nobel Prize in two disciplines: Physics for her work on radioactivity, and Chemistry for her discovery of radium and polonium. #WomenInSTEM

The package formerly known as papercheck has changed its name to metacheck! We're checking more than just papers, with functions to assess OSF projects, github repos, and AsPredicted pre-registrations, with more being developed all the time. scienceverse.github.io/metacheck/

Leiden looking good today ;-) 📢 Abstract submission will be open Nov 1st – Dec 15th for EHBEA 2026 ⚡Present your research, connect & collaborate 14-17 April 📝 300 words (extendable to 800 after acceptance) For more information & our full call for abstracts, check www.ehbea2026.com

New preprint w/ @fbartos.bsky.social , Ben Jones, and @tvpollet.bsky.social . Our reanalyses found *little* evidence that sexual orientation is associated with 2D:4D ratios after accounting for publication bias. 🧵1/7 osf.io/preprints/ps...

That’s insane. Better trying Euromillions jackpot tomorrow (£45M).

New paper out today with Zhian Chen. We argue that modern intensive parenting is not only exhausting for parents, but in some cases disrupts healthy child development. What is 'overparenting'? And can evolutionary theory help us understand how we got here? academic.oup.com/emph/advance...

🚨 AWARD ANNOUNCEMENT 🚨 For the first time, EHBEA is giving an award for this members who excel in public outreach and communication of the evolutionary human sciences 📣 📣 📣 Deadline: December 19, 2025 Check the form below 👇 docs.google.com/document/d/1...

We're psyched to discuss all things disgust in our upcoming conference on Disgust Across Borders! 🦠 Our 2nd (online) keynote is Paul Rozin who will address a fundamental question in Disgustology: "Is disgust a unitary emotion?" 📍 @iast.fr Toulouse 🇫🇷 | Dec 4–5 👀 Stay tuned at tinyurl.com/2tprm9cn!

This is quite interesting.

EHBEA is looking for new PRESIDENT and SECRETARY for 2026-2029! 👀 If you know of anybody who could represent EHBEA, nominate them as president! If you know with good organisational skills, nominate them as secretary! DEADLINE: 16/12/2026 HERE IS THE FORM 👇 docs.google.com/document/d/1...

🌙 We’re looking for young people (18–24) in the UK to take part in a study on sleep, self-harm & daily life. 📱The study involves 2 weeks of short surveys + an optional interview More information in poster or contact me at [email protected]

😢 www.bbc.co.uk/news/live/c9...

A serious failure case is that many biologists seem to have been taught that they should inspect bivariate correlations between predictors and not include pairs with high correlations. That is not even "collinearity" as statisticians define it (where is about joint info in additive model).

Standing up for science is one way to push back against political attacks on the university sector 👇 Experts in biology and anthropology have put together this statement to counter misinformation about race. Please consider signing and sharing